tsconfig.json

{
  "compilerOptions": {
    /* Project Options */
    "allowJs": true,
    "checkJs": true,
    "declaration": true,
    "importHelpers": true,
    "lib": ["ESNext"],
    "module": "ESNext",
    "noEmit": true,
    "sourceMap": true,
    "target": "ES6",

    /* Module Resolution */
    "allowSyntheticDefaultImports": true,
    "esModuleInterop": true,
    "moduleResolution": "Node",

    /* Strict Checks */
    "strict": true,

    /* Linter Checks */
    "noFallthroughCasesInSwitch": true,
    "noImplicitReturns": true,
    "noUnusedLocals": true,
    "noUnusedParameters": true,

    /* Experimental */
    "emitDecoratorMetadata": true,
    "experimentalDecorators": true,

    /* Advanced */
    "forceConsistentCasingInFileNames": true,
    "importsNotUsedAsValues": "error",
    "newLine": "lf",
    "resolveJsonModule": true,
    "skipLibCheck": true,
    "useDefineForClassFields": true
  },
  "ts-node": {
    "compilerOptions": {
      "module": "CommonJS"
    }
  },
  "include": ["src/**/*", "tests/**/*"],
  "files": ["rollup.config.js", "jest.config.js", ".eslintrc.js", ".prettierrc.js"],
  "exclude": ["node_modules"]
}